feat: improve http download strategy to prevent speed drops near completion

[monkeyWie]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 92.81768% with 13 lines in your changes missing coverage. Please review.

Project coverage is 61.38%. Comparing base (bfad91d) to head (6cc9b25).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/protocol/http/fetcher.go	94.18%	8 Missing and 2 partials ⚠️
pkg/download/downloader.go	66.66%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #969      +/-   ##
==========================================
+ Coverage   60.65%   61.38%   +0.72%     
==========================================
  Files          37       37              
  Lines        4649     4713      +64     
==========================================
+ Hits         2820     2893      +73     
+ Misses       1548     1541       -7     
+ Partials      281      279       -2     

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